<?php
/*
    Copyright (C) 2008 - 2010 Inanta Martsanto
    
    This file is part of Koma.

    Koma is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Koma is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Koma.  If not, see <http://www.gnu.org/licenses/>.
    
    Inanta Martsanto (inanta@inationsoft.com)
*/
 
abstract class KomaSingletonObject extends KomaObject implements IKomaSingleton
{
    private static $_instances = array();
    
    static function getInstance()
    {
        throw new KomaOverrideMethodException(__FUNCTION__);
    }
    
    protected static function createInstance($class = null, $args = array())
    {
        if($class == null) throw new KomaMissingArgumentException(__FUNCTION__, 'class');
        if(!isset(self::$_instances[$class])) self::$_instances[$class] = $class;
        
        if(!is_object(self::$_instances[$class]))
        {
            self::$_instances[$class] = new self::$_instances[$class]($args);
            self::$_instances[$class]->initialize();
        }
        
        return self::$_instances[$class];
    }
}
?>